CN104115216B - Driving means and display device - Google Patents
Driving means and display device Download PDFInfo
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- CN104115216B CN104115216B CN201380009288.2A CN201380009288A CN104115216B CN 104115216 B CN104115216 B CN 104115216B CN 201380009288 A CN201380009288 A CN 201380009288A CN 104115216 B CN104115216 B CN 104115216B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0435—Change or adaptation of the frame rate of the video stream
Abstract
Display device (1) is in the case of receiving the change instruction of refresh rate of display floater (2), and the source signal at positive pole is written of the source signal of time and negative pole and is written of the timing of time balance and changes above-mentioned refresh rate.
Description
Technical field
The present invention relates to driving means and display device.
Background technology
In recent years, the display device of slim, light weight representated by liquid crystal indicator and low-power consumption is used in a large number.This
The display device of sample is to such as e-book terminal, smart phone, mobile phone, tablet terminal, PDA (portable data assistance), above-knee
The lift-launch of type personal computer, portable game machine, automobile navigation apparatus etc. is notable.It addition, can expect from now on as more slim
The exploitation of Electronic Paper of display device and universal also fast-developing.In various display devices, power consumption is made to reduce, make display picture
Matter improves the problem becoming common.
Therefore, in the past, about display device, it is contemplated that the various technology for the purpose of solving such problem.
Such as, in order to more improve display image quality, use the technology raising refresh rate.Such as, when showing moving image,
Refresh rate is increased to " 120Hz (that is, 120fps) " from " 60Hz (that is, 60fps) ", thus can show and move more smoothly, and
And the generation of the display unfavorable conditions such as flicker can be suppressed.
But, along with refresh rate raises, correspondingly, drive the number of times of display floater to increase, therefore power consumption can increase.Cause
This, in the case of the minimizing paying attention to power consumption, on the contrary, make the technology that refresh rate reduces.
As its concrete example, Patent Document 1 discloses following technology following: when easily producing false contouring or
During the display significant video of false contouring, make refresh rate high speed to improve image quality on one's own initiative, be difficult to produce the situation of false contouring
Even if descending or in the case of producing the most inapparent video, making refresh rate reduce on one's own initiative and realizing low-power consumption.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Laid-Open Patent Publication " JP 2010-145810 publication (publication date: July 1 in 2010
Day) "
Summary of the invention
The problem that invention is to be solved
(modification of refresh rate based on existing display device)
Here, the modification of refresh rate based on existing display device is described with reference to Fig. 8.Fig. 8 is to represent based on existing
The concept map of modification of refresh rate of display device.
Fig. 8 is by illustrating during frame that certain pixel to existing display device writes its magnitude of voltage than reference voltage more by positive pole
The source signal of side is (hereinafter referred to as " positive pole data ".) and its magnitude of voltage than reference voltage more by negative pole source signal (with
Under be expressed as " negative pole data ".Any one in).In fig. 8, be expressed as "+" frame during represent during this frame above-mentioned
Pixel write positive pole data, represent during being expressed as the frame of "-", during this frame, above-mentioned pixel are write negative pole data.Especially
It is that, in the example shown in Fig. 8, in existing display device, the time cycle as polarity inversion uses " every 1 frame ".Cause
This, in the example shown in Fig. 8, the polarity of above-mentioned pixel as "+,-,+,-... ... " like that by every 1 frame reversion.
As this Fig. 8 illustrates, in existing display device, the timing in the change instruction receiving refresh rate is stood
I.e. change refresh rate.
Such as, in the example shown in Fig. 8, existing display device (timing t 1) after the 3rd frame end receives and will brush
The instruction that new rate changes to 60Hz from 30Hz.Corresponding to this, refresh rate is changed by existing display device immediately to 60Hz.By
This, the later refresh rate of the 4th frame becomes 60Hz.
Here, when 3 frame end, the write number of times of the source signal of positive pole is " 2 ", and the source signal of negative pole
Write number of times be " 1 ".That is, when 3 frame end, the polarity of time and pixel that the polarity in pixel becomes positive pole becomes
Period for the time of negative pole produces the difference of " 2/60 second ".Refresh rate is changed later, and the most existing display device can not disappear
Except this time difference.Such as, even if write the source signal of negative pole at the 4th frame, also it is " 1/60 second " during this period, therefore, the most former
Sample ground produces the above-mentioned time difference of " 1/60 second ".Such time difference (that is, the inclination of polarity) becomes the displays such as generation ghost not
The main cause of good situation.
The present invention completes in view of the above-mentioned problems, its object is to provide the change being difficult to adjoint refresh rate
The display device of display unfavorable condition.
For solving the scheme of problem
The present invention is to solve above-mentioned problem, the driving means of a mode of the present invention drives has the aobvious of multiple pixel
Showing that panel, above-mentioned driving means are characterised by, possess refresh rate changing unit, above-mentioned refresh rate changing unit is to above-mentioned aobvious
Show that at least one pixel of panel is alternatively written into the source signal of positive pole and the source of negative pole in units of 1 frame or multiple frame
In the case of the change instruction of the refresh rate receiving above-mentioned display floater during the signal of pole, at least one pixel above-mentioned,
The source signal of above-mentioned positive pole is written of the source signal of time and above-mentioned negative pole and is written of the timing change of time balance
Above-mentioned refresh rate, above-mentioned refresh rate changing unit, at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written into
Time and the source signal of above-mentioned negative pole be written of time equal timing and change above-mentioned refresh rate, with N number of frame as list
Bit interleaving ground receives above-mentioned change when writing the frame reversion driving of the source signal of above-mentioned positive pole and the source signal of above-mentioned negative pole
When more indicating, the source signal at above-mentioned positive pole is written of the source signal of frame number and above-mentioned negative pole and is written of frame number not
In the case of equal, make the constant time lag frame to the multiple becoming 2N of above-mentioned change.
It addition, the driving means of the mode according to the present invention, it drives the display floater with multiple pixel, above-mentioned drives
Dynamic device is characterised by possessing refresh rate changing unit, and above-mentioned refresh rate changing unit is to above-mentioned display floater at least
One pixel receives when being alternatively written into the source signal of the source signal of positive pole and negative pole in units of 1 frame or multiple frame
In the case of the change instruction of the refresh rate of above-mentioned display floater, at least one pixel above-mentioned, in the source of above-mentioned positive pole
Pole signal is written of the source signal of time and above-mentioned negative pole and is written of the timing of time balance and changes above-mentioned refresh rate, on
Stating refresh rate changing unit, at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written of time and above-mentioned
The source signal of negative pole is written of time equal timing and changes above-mentioned refresh rate, above-mentioned refresh rate changing unit, is carrying out
In the case of the next frame of the frame of the change of above-mentioned refresh rate receives above-mentioned change instruction, do not carry out based on this change instruction
The change of above-mentioned refresh rate.
It addition, the display device of a mode of the present invention is characterised by possessing: have the display floater of multiple pixel；With
And above-mentioned driving means.
Invention effect
A mode according to the present invention, is provided that following display device: even changing the feelings of the refresh rate of display floater
Condition, in each pixel of display floater, positive pole data be written of the time and negative pole data to be written of the time the most equal, the most just
It is the inclination said and the polarity in each pixel does not occurs, therefore, it is difficult to occur the ghost of the change with refresh rate etc. to show bad feelings
Condition.
Accompanying drawing explanation
Fig. 1 is the figure being monolithically fabricated of the display device representing embodiment.
Fig. 2 is the figure of the display floater representing the state utilizing polarity inversion mode " some reversion " write source signal.
Fig. 3 is the figure of the display floater representing the state utilizing polarity inversion mode " source electrode reversion " write source signal.
Fig. 4 is the concept map of the modification of the refresh rate representing display device based on embodiment.
Fig. 5 is the concept map of other modification of the refresh rate representing display device based on embodiment.
Fig. 6 is the concept map of another other modification of the refresh rate representing display device based on embodiment.
Fig. 7 is the figure of the characteristic representing the various TFT comprising the TFT using oxide semiconductor.
Fig. 8 is the concept map of the modification representing refresh rate based on existing display device.
Fig. 9 represents the concrete example of the decision method corresponding with various conditions of display device based on embodiment.
Detailed description of the invention
About embodiments of the present invention, it is described with reference to as follows.
(composition of display device)
First, with reference to Fig. 1, the configuration example of the display device 1 of embodiment is illustrated.Fig. 1 is to represent embodiment 1
The figure being monolithically fabricated of display device 1.
As it is shown in figure 1, display device 1 possesses display floater 2, circuit of display driving 10 and power supply generative circuit 28.
Wherein, circuit of display driving 10 possesses timing controller 12, scan line drive circuit 14, signal-line driving circuit 16 and is total to
With electrode drive circuit 18.
This display device 1 is at e-book terminal, smart phone, mobile phone, PDA, laptop PC, portable game
As for showing that the display device of various information is carried in machine, automobile navigation apparatus etc..In embodiments, as display
Device 1 uses the liquid crystal indicator of active array type.Therefore, the display floater 2 of present embodiment is the liquid of active array type
LCD panel, other above-mentioned element is constituted in the way of driving such display panels.
(display floater)
Display floater 2 possesses multiple pixel, a plurality of gate line G and a plurality of source signal line S.
Multiple pixels are arranged to include the so-called clathrate of multiple pixel column and multiple pixel column.
A plurality of gate line G is set up in parallel in pixel column direction (along the direction of pixel column).A plurality of gate line G
The pixel column respective pixel electrical connection the most corresponding with multiple pixel columns.
A plurality of source signal line S is set up in parallel in pixel row direction (along the direction of pixel column), all believes with a plurality of grid
Number line G is the most orthogonal.The a plurality of respective pixel of pixel column each corresponding with multiple pixel columns for source signal line S is electrically connected
Connect.
In the example depicted in figure 1, display floater 2 is provided with the multiple pixels being arranged to N row × M row, corresponding to this
Ground, is provided with N bar source signal line S and M bar gate line G.
(scan line drive circuit)
Scan line drive circuit 14 selects and scans a plurality of gate line G successively.Specifically, scan line drive circuit 14
Select a plurality of gate line G successively, the gate line G selected is provided for by each pixel on this gate line G
The switch element (TFT) possessed switches to the conducting voltage of conducting.
(signal-line driving circuit)
Signal-line driving circuit 16 is in gate line G selected period, for each picture on this gate line G
Element, provides source signal corresponding with view data from corresponding source signal line S.When illustrating, holding wire drives electricity
Road 16, based on the video signal being transfused to, calculates the value that should export the voltage to each pixel on selected gate line G,
The voltage of this value is exported towards each source signal line S from source follower amplifier.As a result of which it is, to selected signal
Each pixel on line G provides source signal, source signal is write.
(common electrode drive circuit)
Common electrode drive circuit 18 provides for driving this common electrode being located at the respective common electrode of multiple pixel
The shared voltage of regulation.
(timing controller)
From outside (being system side control portion 30 in the example depicted in figure 1) to timing controller 12 incoming video signal and
Control signal.Video signal shown here comprises clock signal, synchronizing signal, viewdata signal.It addition, sometimes control letter
Number comprise the change instruction of refresh rate.Further, timing controller 12 is according to this video signal and control signal, such as solid line in Fig. 1
As shown in arrow, the output of each drive circuit is used for the various control signals of each drive circuit synchronously action.
Such as, timing controller 12 provides grid initial pulse signal, gate clock signal to scan line drive circuit 14
GCK and grid output control signal GOE.Scan line drive circuit 14, when receiving grid initial pulse signal, starts a plurality of
The scanning of gate line G.Further, scan line drive circuit 14 exports control signal according to gate clock signal GCK and grid
GOE provides conducting voltage successively to each gate line G.
It addition, timing controller 12 exports source electrode initial pulse signal to signal-line driving circuit 16, source electrode latches gating
And source electrode clock signal.Signal-line driving circuit 16, will input according to source electrode clock signal based on source electrode initial pulse signal
The view data of each pixel be stored in depositor, latch gating signal according to next source electrode, each source signal line S is provided with
The corresponding source signal of view data.
(power supply generative circuit)
Power supply generative circuit 28 generates scan line drive circuit 14, signal-line driving circuit 16 from input power and shares
Each voltage needed for electrode drive circuit 18, above-mentioned input power (is system side control portion from outside in the example depicted in figure 1
30) supply.Further, as indicated by the dashed arrow in fig. 1, scan line drive circuit 14, holding wire are driven by power supply generative circuit 28
Circuit 16 and common electrode drive circuit 18 each provide the voltage of generation.
(additional function of display device 1)
Here, the additional function possessing display device 1 illustrates.Display device 1 is also equipped with polarity inversion control portion
20, refresh rate changing unit 22, Variation control portion 24 and enumerator 26.In the example depicted in figure 1 so that timing controller 12
Realize above-mentioned each function, but so that utilize the circuit etc. beyond timing controller 12 to realize above-mentioned each function.
(polarity inversion control portion 20)
Polarity inversion control portion 20 control signal line drive circuit 16 is to polarity inversion during each pixel write source signal
Mode.
The polarity inversion mode that polarity inversion control portion 20 controls comprises: week time of the polarity inversion of regulation source signal
The mode of phase；And the mode of the space periodic of the polarity inversion of regulation source signal.
So-called " time cycle of the polarity inversion of source signal " provides as follows: in display floater 2, with several frames as list
Position makes to be located at the respective polarity inversion of multiple pixels of this display floater 2.It is on the other hand, so-called that " polarity of source signal is anti-
The space periodic turned " provide as follows: on pixel column direction on the display surface of display floater 2 and pixel row direction, with several
Pixel is the polarity inversion that unit makes pixel.
Signal-line driving circuit 16 with controlled by polarity inversion control portion 20 polarity inversion mode (the above-mentioned time cycle and
Above-mentioned space periodic) each pixel is write source signal.
(refresh rate changing unit 22)
Refresh rate changing unit 22 changes the refresh rate of display floater 2.So-called refresh rate represents the display rewriting display floater 2
Frequency.Such as, in the case of refresh rate is " 60Hz ", rewrote the display of 60 display floaters 2 at 1 second (that is, at 1 second
Clock shows 60 frames), in the case of refresh rate is " 120Hz ", rewrote the display of 120 display floaters 2 at 1 second (that is, 1
Second display 120 frames).
Typically, in display floater, refresh rate is the highest, and display image quality is the best, on the other hand, owing to the frequency rewritten carries
Height, therefore power consumption uprises.Therefore, the most such as make in the display situation of moving image, the high image quality selected situation of pattern etc.
In the case of display image quality is preferential, refresh rate is set to height, is showing that the situation of rest image, low-power consumption mode are selected
In the case of situation etc. make low-power consumption preferential, refresh rate is set to low.
In the present embodiment, display device 1 receives the change of refresh rate from external device (ED) (such as, systems control division 30)
Instruction, correspondingly, refresh rate changing unit 22 changes refresh rate.In addition, timing controller 12 sends itself the most sometimes
The change instruction of refresh rate.In this case, refresh rate changing unit 22 changes refresh rate according to the decision of timing controller 12.
Additionally, timing controller 12 itself send the situation of the change instruction of refresh rate be also contained in receive the present invention " refresh rate
The situation of change instruction " definition.
When the refresh rate of display floater 2 is changed, various according to from timing controller 12 of each portion of display device 1
Control signal, drives display floater 2 in the way of making display floater 2 carry out display action with the refresh rate after change.
(Variation control portion 24)
Variation control portion 24 controls refresh rate changing unit 22 and changes the timing of refresh rate.
As it has been described above, for each pixel of display floater 2, be alternatively written into positive pole in units of 1 frame or multiple frame
Data and negative pole data.
In the case of the change instruction of the refresh rate that Variation control portion 24 receives display floater 2 in display device 1, respectively
In pixel, with positive pole data based on refresh rate before changing be written of the time and negative pole data to be written of the time equal
Timing carry out the mode of change of refresh rate, control the change of refresh rate based on refresh rate changing unit 22.
Thus, in each pixel, positive pole data be written of the time and negative pole data to be written of the time equal, can realize
Prevent the generation of the unfavorable conditions such as ghost in each pixel.
(enumerator 26)
Enumerator 26 aligns number of poles evidence and negative pole data are written of number of times and count.In the present embodiment, as
Enumerator 26, uses odd-even counter, and above-mentioned odd-even counter output cathode data are written of number of times and negative pole data are write
The sum of the number of times entered is even number or odd number.Variation control portion 24 is by referring to the output from enumerator 26, and can determine should
Carry out the timing of the change of refresh rate.
Such as, enumerator 26 exports the high level signal representing this meaning in the case of above-mentioned sum is even number, upper
Stating sum is the low level signal that output represents this meaning in the case of odd number.It is however not limited to this, the letter of enumerator 26 output
As long as number at least can be judged that above-mentioned sum is the signal of even number or odd number by Variation control portion 24, it can be arbitrary letter
Number.
(odd-even counter)
As in the present embodiment, in the case of enumerator 26 uses odd-even counter, enumerator 26 can be with polarity
The time cycle of reversion synchronously carries out above-mentioned counting (that is, when polarity inversion is carried out in time).E.g. following feelings
Condition: in the case of the time cycle as polarity inversion uses " 1 frame reversion ", enumerator 26 carries out above-mentioned counting by every 1 frame,
In the case of the time cycle as polarity inversion uses " 2 frames reversion ", carry out above-mentioned counting and above-mentioned signal by every 2 frames
Output.Thus, even if the time cycle of polarity inversion is not " 1 frame reversion ", Variation control portion 24 also can utilize from enumerator
The output signal (even number and odd number) of 26 judges that the write number of times writing number of times and negative pole data of positive pole data is the most equal.
(other enumerator)
Additionally, enumerator 26 could be used that aligns number of poles according to being written of frame number and negative pole data are written of frame number respectively
The enumerator of counting.In this case, Variation control portion 24 is preferably in the case of both frame numbers are equal or both frame
In the case of the difference of number is less than the quantity predetermined, it is judged that for being the timing of the change that should carry out refresh rate.It addition, in these feelings
Under condition, the frame during being set to scanning is not only counted by preferably enumerator 26, and is also carried out the frame being set to during stopping
Counting.This is because each pixel also keeps the state being written into data during stopping, should also be as data during this termination
It is written of period and adds up.
(concrete example of polarity inversion mode)
The brightest to polarity inversion mode referring to Fig. 2 and Fig. 3.Here, use as being located at the one of display floater 2
The multiple pixels being arranged to 6 pixel column × 4 pixel columns of partial pixel, are " some reversion " and polarity inversion to polarity inversion mode
Mode each illustrates for " source electrode reversion ".
Fig. 2 is to represent the figure utilizing polarity inversion mode " some reversion " to be written with the display floater 2 of the state of source signal.
On the other hand, Fig. 3 is to represent the display floater 2 utilizing polarity inversion mode " source electrode reversion " to be written with the state of source signal
Figure.
In figs. 2 and 3, "+" pixel that represents represents the state that this pixel is written with positive pole data, "-" represents
Pixel represents the state that this pixel is written with negative pole data.
It addition, in figs. 2 and 3, in (a) and (b), the polarity inversion of the respective source signal of multiple pixels.
(space periodic of polarity inversion)
As in figure 2 it is shown, according to polarity inversion mode " some reversion ", the pixel in each pixel column be arranged in display floater
Direction in space (pixel column direction and pixel row direction) as "+,-,+,-" or "-,+,-,+", become source signal
Polarity by the state of every 1 pixel inversion.
It addition, as it is shown on figure 3, according to polarity inversion mode " source electrode reversion ", the configuration of the pixel in each pixel column as "+,
+ ,+,+" or "-,-,-,-" like that, the polarity of the source signal of all of pixel is identical.It addition, in each pixel column
The configuration of pixel as "+,-,+,-" or "-,+,-,+", become the polarity of source signal by every 1 pixel inversion
State.
(time cycle of polarity inversion)
As in figure 2 it is shown, in the case of the space periodic as polarity inversion uses " some reversion ", and anti-as polarity
In the case of the time cycle turned uses " 1 frame reversion ", display floater 2 such as " (a), (b) of Fig. 2, (a) of Fig. 2 of Fig. 2, Fig. 2
(b) ... " like that, become the polarity state by every 1 frame reversion of each pixel.It addition, in week time as polarity inversion
In the case of phase uses " 2 frame reversion ", as " (a), (a) of Fig. 2, (b) of Fig. 2 of Fig. 2, (b) of Fig. 2 ... " is such, become
The polarity of each pixel is by the state of every 2 frame reversions.
Equally, as it is shown on figure 3, in the case of the space periodic as polarity inversion uses " source electrode reversion ", and making
In the case of the time cycle employing " 1 frame reversion " of polarity inversion, display floater 2 is such as " (a), (b) of Fig. 3 of Fig. 3, Fig. 3's
(a), (b) of Fig. 3 ... " like that, the polarity of each pixel is by every 1 frame reversion.It addition, in the time cycle as polarity inversion
In the case of using " 2 frame reversion ", as " (a), (a) of Fig. 3, (b) of Fig. 3 of Fig. 3, (b) of Fig. 3 ... " is such, become each
The polarity of pixel is by the state of every 2 frame reversions.
(modification of refresh rate)
Then, the modification of the refresh rate of display device 1 based on embodiment is described with reference to Fig. 4.Fig. 4 be represent based on
The concept map of the modification of the refresh rate of the display device 1 of embodiment.
Fig. 4 is by the one represented during frame in the write positive pole data of certain pixel to display device 1 and negative pole data.At figure
In 4, "+" represent during this frame during the frame that represents in above-mentioned pixel write table during positive pole data, the frame that "-" represents
In showing during this frame, above-mentioned pixel is write negative pole data.Particularly, in the example shown in Figure 4, in display device 1,
" every 1 frame " is used as the time cycle of polarity inversion.Therefore, in the example shown in Figure 4, the polarity of above-mentioned pixel is such as
"+,-,+,-... " like that by every 1 frame reversion.
As this Fig. 4 illustrates, receive the timing of the change instruction of refresh rate in display device 1, based on before changing
The write number of times of positive pole data of refresh rate and the write number of times of negative pole data equal in the case of, Variation control portion 24 is at this
Timing controls refresh rate changing unit 22 in the way of change refresh rate.
On the other hand, receive the timing of the change instruction of refresh rate in display device 1, based on refresh rate before changing
The write number of times of positive pole data and the write number of times of negative pole data unequal in the case of, Variation control portion 24 is in positive pole data
The timing that the write number of times of write number of times and negative pole data is equal controls refresh rate changing unit 22 in the way of change refresh rate.
Such as, in the example shown in Figure 4, display device 1 (timing t 1) after the 4th frame end receives and is become by refresh rate
The instruction of more 30Hz.Now, the write number of times of positive pole data based on refresh rate (60Hz) before changing is 2 times, negative pole number
According to write number of times be also 2 times.Therefore, enumerator 26 be output into " even number ".
Based on this output, Variation control portion 24 is judged as write number of times and the write number of times of negative pole data of positive pole data
Equal.Therefore, Variation control portion 24 controls refresh rate changing unit 22 in this timing (timing t 1) in the way of changing refresh rate.With
This is corresponding, and the refresh rate of (after timing t 1) after the 5th frame is changed to 30Hz by refresh rate changing unit 22.
Then, display device 1 (timing t 2) after the 7th frame end receives the instruction that refresh rate is changed to 60Hz.This
Time, the write number of times of positive pole data based on refresh rate (30Hz) before changing is 2 times, and the write number of times of negative pole data is 1 time.
Therefore, enumerator 26 be output into " odd number ".
Based on this output, Variation control portion 24 is judged as the write number of times writing number of times and negative pole data of positive pole data not
Equal.Therefore, Variation control portion 24 makes constant time lag 1 frame amount of change refresh rate, at write number of times and the negative pole of positive pole data
The write equal timing (timing t 3) of number of times of data, controls refresh rate changing unit 22 in the way of changing refresh rate.With this phase
Should, the refresh rate of (after timing t 3) after the 9th frame is changed to 60Hz by refresh rate changing unit 22.
And, display device 1 (timing t 4) after the 9th frame end receives the instruction that refresh rate is changed to 30Hz.This
Time, the write number of times of positive pole data based on refresh rate (60Hz) before changing is 1 time, and the write number of times of negative pole data is 0 time.
Therefore, enumerator 26 be output into " odd number ".
Based on this output, Variation control portion 24 is judged as the write number of times writing number of times and negative pole data of positive pole data not
Equal.Therefore, Variation control portion 24 makes constant time lag 1 frame amount of change refresh rate, at write number of times and the negative pole of positive pole data
The write equal timing (timing t 5) of number of times of data, controls refresh rate changing unit 22 in the way of changing refresh rate.With this phase
Should, the refresh rate of (after timing t 5) after the 11st frame is changed to 60Hz by refresh rate changing unit 22.
Additionally, during the display device 1 of present embodiment arranges the termination not driving display floater 2, thus reduce display
The refresh rate of panel 2.Such as, as shown in Figure 4, in the situation that the refresh rate of display floater 2 is changed to from " 60Hz " " 30Hz "
Under, during being alternately arranged the scanning of 1/60 second and during the termination of 1/60 second, thus the refresh rate of display floater 2 is changed to
“30Hz”。
It addition, the display device 1 of present embodiment be alternately arranged 1/60 second scanning during and the termination phase of 59/60 second
Between, the most also the refresh rate of display floater 2 can be changed to " 1Hz ".In addition, the display device 1 of present embodiment also can
The refresh rate of display floater 2 is changed to arbitrary refresh rate.
So, the display device 1 of present embodiment by reducing refresh rate during arranging termination, so be not provided with
Reduce refresh rate during only to compare, can more reduce power consumption.
Particularly, as described later, the display device 1 of present embodiment uses use cut-off characteristics the most excellent in each pixel
The TFT of good oxide semiconductor, during comprising termination, the energy long term maintenance state to each pixel write view data,
So reduce the situation of refresh rate even with such method, high display image quality also can be maintained.
That is, the sweep time in the display device 1 of present embodiment, before each pixel is also maintained at tightly during above-mentioned termination
Between be written of view data.Therefore, in the display device 1 of present embodiment, " when the source signal of positive pole is written of
Between " refer to write the time being added together during scanning and during its termination after tight of positive pole data, " the source electrode letter of negative pole
Number be written of the time " refer to will during the scanning of write negative pole data and its tight after termination during time of being added together.
Additionally, the method reducing refresh rate is not limited to said method, it is also possible to the length during being scanned by adjustment is dropped
Low refresh rate.Such as, by the refresh rate of display floater 2 in the case of " 60Hz " is changed to " 30Hz ", can set continuously
During putting the scanning of 2/60 second, thus the refresh rate of display floater 2 is changed to " 30Hz ".
So, during being not provided with stopping in the case of, in the display device 1 of present embodiment, " the source electrode of positive pole letter
Number it being written of the time " during the scanning that refers to write positive pole data, " source signal of negative pole is written of the time " refers to write
During entering the scanning of negative pole data.
(other modification of refresh rate)
Then, other modification of the refresh rate of display device 1 based on embodiment is described with reference to Fig. 5.Fig. 5 is to represent
The concept map of other modification of the refresh rate of display device 1 based on embodiment.
In the example as shown in fig. 5, in display device 1, use " every 3 frames " in the time cycle as polarity inversion
Aspect is different from Fig. 4.Therefore, in the example as shown in fig. 5, the polarity of subject pixels as "+,+,+,-,-,-,+,+,
+ ... " like that by every 3 frame reversions.
As this Fig. 5 illustrates, use the reversion of N frame to drive in display device 1, and receive refreshing in display device 1
The write number of times of the timing of the change instruction of rate positive pole based on refresh rate before changing data and the write number of times of negative pole data
In the case of unequal, Variation control portion 24 is meeting following condition (1) and condition (2) both timings, to change refresh rate
Mode control refresh rate changing unit 22.
(1) the write number of times of positive pole data and the write number of times of negative pole data are equal.(2) after the frame end of the multiple of 2N.
Such as, in the example as shown in fig. 5, display device 1 (timing t 2) after the 8th frame end receives and is become by refresh rate
The instruction of more 60Hz.Now, the write number of times of positive pole data based on refresh rate (30Hz) before changing is 2 times, negative pole number
According to write number of times be 0 time.
In this case, Variation control portion 24 makes the constant time lag of change refresh rate to meeting above-mentioned condition (1) and above-mentioned
Till after both the 12nd frame ends of condition (2), in this timing (timing t 3), in the way of changing refresh rate, control refresh rate become
More portion 22.Corresponding to this, the refresh rate of (after timing t 3) after the 13rd frame is changed to 60Hz by refresh rate changing unit 22.
(effect)
As it has been described above, the display device 1 of present embodiment uses following composition: receiving the refresh rate of display floater
In the case of change instruction, make the change constant time lag of refresh rate, carrying out the number of times of write of positive pole data and carrying out
Refresh rate is changed in the timing that the number of times of the write of negative pole data is equal.
Thus, the display device 1 of present embodiment, in each pixel of display floater 2, can be write not having positive pole data
Change the refresh rate of display floater 2 under the state of the time difference that the time entered and negative pole data are written of the time, can prevent from sending out
The unfavorable conditions such as the ghost in raw each pixel.
(another other modification of refresh rate)
Then, another other modification of the refresh rate of display device 1 based on embodiment is described with reference to Fig. 6.Fig. 6 is
Represent the concept map of another other modification of the refresh rate of display device 1 based on embodiment.
In the example shown in Fig. 6, in display device 1, use " every 1 frame " in the time cycle as polarity inversion
Aspect is identical with Fig. 4.Therefore, in the example shown in Fig. 6, the polarity of subject pixels as "+,-,+,-... " press like that
Every 1 frame reversion.
As this Fig. 6 illustrates, Variation control portion 24 receives at the next frame of the frame of the change carrying out refresh rate
In the case of the change instruction of refresh rate, in the way of not carrying out the change of refresh rate based on this change instruction, control refresh rate
Changing unit 22.
Such as, in the example shown in Fig. 6, refresh rate is changed to by display device 1 (timing t 1) after the 2nd frame end
60Hz.Then, after the 3rd frame end, (timing t 2) receives the instruction of change refresh rate.
In this case, Variation control portion 24 controls in the way of not carrying out the change of refresh rate based on this change instruction
Refresh rate changing unit 22.Therefore, the change of refresh rate based on refresh rate changing unit 22 is not carried out.
According to this modification, display device 1, also in each pixel of display floater 2, can be written into not having positive pole data
Time and the negative pole data time difference that is written of the time state under change the refresh rate of display floater 2, therefore can prevent
There is the unfavorable conditions such as ghost in each pixel.
(pixel of display floater 2)
Then, the pixel of the display floater 2 that the display device 1 of embodiment possesses is illustrated.
In the display device 1 of present embodiment, the respective TFT of multiple pixels possessed as display floater 2, employing makes
With the TFT of so-called oxide semiconductor, particularly, use and use as including indium (In), gallium (Ga) and the oxygen of zinc (Zn)
The so-called IGZO (InGaZnOx) of compound is as the TFT of above-mentioned oxide semiconductor.Following description uses oxide semiconductor
The advantage of TFT.
(TFT characteristic)
Fig. 7 is the figure of the characteristic representing the various TFT comprising the TFT using oxide semiconductor.In this Fig. 7, it is shown that
The TFT using oxide semiconductor, the TFT using a-Si (amorphous silicon: non-crystalline silicon) and use LTPS
The respective characteristic of TFT of (Low Temperature Poly Silicon: high temperature polysilicon).
In the figure 7, transverse axis (Vgh) represents the magnitude of voltage of the conducting voltage being supplied to grid in above-mentioned each TFT, the longitudinal axis
(Id) magnitude of current between the source drain in above-mentioned each TFT is represented.
Particularly, the period shown in FIG as " TFT-on " represents that the magnitude of voltage according to conducting voltage becomes conducting shape
The period of state, the period shown in FIG as " TFT-off " represents that the magnitude of voltage according to conducting voltage becomes the phase of cut-off state
Between.
As it is shown in fig. 7, use oxide semiconductor TFT with use a-Si TFT compared with conducting state time electronics move
Shifting rate is high.
Although the diagram of omission, but specifically, Id electric current when using the TFT-on of TF of a-Si is 1uA, and uses
Id electric current during the TFT-on of the TFT of oxide semiconductor is 20～50uA degree.
It can thus be appreciated that: use oxide semiconductor TFT with use a-Si TFT compared with conducting state time electronics move
Shifting rate exceeds 20～50 times of degree, and on state characteristic is the most excellent.
As it has been described above, the display device 1 of present embodiment uses in each pixel uses such oxide semiconductor
TFT.Thus, the on state characteristic of the TFT of the display device 1 of present embodiment is excellent, therefore can drive picture with smaller TFT
Element, so in each pixel, can reduce the ratio of the area that TFT accounts for.That is, the aperture opening ratio in each pixel can be improved, improve backlight
The absorbance of source light.As a result of which it is, the backlight that power consumption is few can be used, or the brightness of backlight can be suppressed, so can reduce
Power consumption.
Further, since the on state characteristic of TFT is excellent, the most also can more shorten the source signal write relative to each pixel
Time, so the refresh rate of display floater 2 can easily be improved.
It addition, as it is shown in fig. 7, leakage current ratio when using the cut-off state of the TFT of oxide semiconductor uses a-Si's
TFT is few.
Although the diagram of omission, but specifically, Id electric current when using the TFT-off of TFT of a-Si is 10pA, and makes
It is 0.1pA degree with the Id electric current during TFT-off of the TFT of oxide semiconductor.
It can thus be appreciated that: using the leakage current during cut-off state of TFT of oxide semiconductor is the TFT using a-Si
1/100 degree, is nearly free from leakage current, and cut-off characteristics is the most excellent.
Thus, the cut-off characteristics of the TFT of the display device 1 of present embodiment is excellent, therefore can long term maintenance display floater
The respective source signal of multiple pixels be written of state, so high display image quality can be maintained, and display can be easily reduced
The refresh rate of panel 2.
(concrete example of decision method corresponding with various conditions)
Display device 1 can use various enumerator 26.It addition, display device 1 can use the various polarity inversion cycle.Separately
Outward, display device 1 is set to 1 frame during the most sometimes scanning 1, and is set to n frame during sometimes scanning 1.It addition, it is aobvious
During showing device 1 is not provided with stopping the most sometimes, and during sometimes stopping 1, it is set to 1 frame, the most sometimes stops the phase by 1
Between be set to n frame.Above-mentioned various condition is to judging that positive pole data are written of the time and negative pole data are written of time whether phase
Deng decision method also bring impact.
It is therefore preferable that display device 1 can carry out with the above-mentioned corresponding decision method of various conditions above-mentioned sentencing by using
Fixed.The concrete example of decision method corresponding with various conditions is described referring to Fig. 9.Fig. 9 represents display based on embodiment
The concrete example of the decision method corresponding with various conditions of device 1.Various bars in each concrete example shown in (a)～(d) of Fig. 9
Part and decision method are as follows.
● (a) of Fig. 9: example 1
During scanning: every 1 frame
During termination: every 3 frames
The polarity inversion cycle: during every 1 scanning (not carrying out polarity inversion during stopping)
Enumerator 26: number (that is, write number of times) during scanning is counted, can using the number of counting as " even number " and
" odd number " exports
Decision method: in the case of the output of enumerator 26 is " even number ", it is determined that for " positive pole data are written of the time
To be written of the time equal with negative pole data ".
Such as, in the example shown in (a) of Fig. 9, in the 9th frame, being output into " even number " of enumerator 26, now,
Display device 1 be judged to " positive pole data are written of the time and negative pole data be written of the time equal (shown in FIG as
" can ") ".
In the example shown in (a) of Fig. 9, in the 9th frame, it is " 4 " that the positive pole data before it are written of frame number, negative
Number of poles is also " 4 " according to being written of frame number.Therefore, it can be said that above-mentioned judgement is suitable.
● (b) of Fig. 9: example 2
During scanning: every 3 frames
During termination: every 3 frames
The polarity inversion cycle: during every 1 scanning (not carrying out polarity inversion during stopping)
Enumerator 26: balanced polarities can be counted.Specifically, enumerator 26 increases whenever positive pole data are written of frame
Then can add 1 when adding 1, whenever negative pole data are written of then to subtract 1 when frame increases by 1
Decision method: in the case of the output of enumerator 26 is " ± 0 ", it is determined that for " positive pole data are written of the time
To be written of the time equal with negative pole data ".
Such as, in the example shown in (b) of Fig. 9, in the 12nd frame, being output into " ± 0 " of enumerator 26, now,
Display device 1 be judged to " positive pole data are written of the time and negative pole data be written of the time equal (shown in FIG as
" can ") ".
In the example shown in (b) of Fig. 9, write positive pole data at the 1st frame, write negative pole data at the 2nd frame, the 3rd
Frame write positive pole data, but during the 4th～6 frames are termination, therefore these positive pole data are kept.Then, negative in the 7th frame write
Number of poles evidence, writes positive pole data at the 8th frame, writes negative pole data at the 9th frame, but during the 10th～12 frames are termination, therefore
These negative pole data are kept.
That is, in the 12nd frame, it is " 6 " that positive pole data are written of frame number, and it is also " 6 " that negative pole data are written of frame number.
Therefore, it can be said that above-mentioned judgement is suitable.
● (c) of Fig. 9: example 3
During scanning: every 1 frame
During termination: every 4 frames
The polarity inversion cycle: every 1 frame (is also carried out polarity inversion) during stopping
Enumerator 26: as example 3, can count balanced polarities
Decision method: in the case of the output of enumerator 26 is " ± 0 ", it is determined that for " positive pole data are written of the time
To be written of the time equal with negative pole data ".
Such as, in the example shown in (c) of Fig. 9, in the 10th frame, being output into " ± 0 " of enumerator 26, now,
Display device 1 be judged to " positive pole data are written of the time and negative pole data be written of the time equal (shown in FIG as
" can ") ".
In the example shown in (c) of Fig. 9, write positive pole data at the 1st frame, but during the 2nd～4 frames are termination, because of
These these positive pole data are kept.In the drawings, the 2nd～4 frames carry out polarity inversion, but this represents source follower amplifier
The data of polarity, actually this polarity are also not written into, and the positive pole data of the 1st frame are kept.
Then, write negative pole data at the 6th frame, but during the 7th～10 frames are termination, these negative pole data are kept.?
In figure, the 7th～10 frames carry out polarity inversion, but this represents the polarity of source follower amplifier, actually this polarity
Data are also not written into, and the negative pole data of the 6th frame are kept.
That is, in the 10th frame, it is " 5 " that positive pole data are written of frame number, and it is also " 5 " that negative pole data are written of frame number.
Therefore, it can be said that above-mentioned judgement is suitable.
● (d) of Fig. 9: example 4
During scanning: every 3 frames
During termination: every 4 frames
The polarity inversion cycle: every 1 frame (is also carried out polarity inversion) during stopping
Enumerator 26: balanced polarities can be counted
Decision method: in the case of the output of enumerator 26 is " ± 0 ", it is determined that for " positive pole data are written of the time
To be written of the time equal with negative pole data ".
Such as, in the example shown in (d) of Fig. 9, in the 14th frame, being output into " ± 0 " of enumerator 26, now,
Display device 1 be judged to " positive pole data are written of the time and negative pole data be written of the time equal (shown in FIG as
" can ") ".
In the example shown in (d) of Fig. 9, write positive pole data at the 1st frame, write negative pole data at the 2nd frame, the 3rd
Frame write positive pole data, but during the 4th～7 frames are termination, therefore these positive pole data are kept.In the drawings, at the 4th～7 frames
In carried out polarity inversion, but this represents the polarity of source follower amplifier, the data of polarity the most shown here are also
Being not written into, the positive pole data of the 3rd frame are kept.
Then, write negative pole data at the 8th frame, write positive pole data at the 9th frame, write negative pole data at the 10th frame, but
It is that during the 11st～14 frames are termination, therefore these negative pole data are kept.In the drawings, in the 11st～14 frames, polarity has been carried out anti-
Turning, but this represents the polarity of source follower amplifier, the data of polarity the most shown here are also not written into, the 10th frame
Negative pole data be kept.
That is, in the 14th frame, it is " 7 " that positive pole data are written of frame number, and it is also " 7 " that negative pole data are written of frame number.
Therefore, it can be said that above-mentioned judgement is suitable.
(supplementary notes)
Above embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned embodiment, energy
Various change is carried out in the scope shown in claim.That is, the technical approach suitably changed in the scope shown in claim is made
The embodiment combined and obtain also is contained in the technical scope of the present invention.
Such as, the polarity of the time cycle of the polarity inversion of the refresh rate shown in embodiment, source signal, source signal
Each setting values such as the space periodic of reversion only illustrate.Therefore, according to the characteristic of display device, application target etc., these
Setting value the most suitable the most variable value.
It addition, illustrate following example in embodiments: apply the invention to use in each pixel use oxidation
The display device of the TFT of thing quasiconductor (particularly IGZO), but it is not limited to this, also can apply the invention in each pixel
Other the display device of TFT such as TFT use the TFT using a-Si, using LTPS.
It addition, in embodiments, the enumerator 26 possessed as timing controller 12 uses odd-even counter, above-mentioned very
The sum of the write number of times of even enumerator output cathode data and the write number of times of negative pole data is even number or odd number, but can
To use the enumerator exporting above-mentioned sum.Or, as enumerator 26, it is possible to use the write time of output cathode data respectively
The enumerator of the write number of times of number and negative pole data.Or, as enumerator 26, it is possible to use output cathode data are write respectively
The frame number entered and negative pole data are written of the enumerator of frame number.No matter which kind of situation, Variation control portion 24 can easily determine
Positive pole data are written of the time and negative pole data are written of whether the time balances.
Additionally, the display device of embodiment is if being at least written of the time and negative pole data are write in positive pole data
The composition of the timing change refresh rate of the time balance entered, then be not limited to the composition illustrated in embodiments, what use
Composition.
Such as, the write number of times of write number of times and negative pole data that the display device of embodiment can align number of poles evidence divides
Do not count, change refresh rate in both equal timings or both differences less than the timing of the threshold value predetermined.
It addition, the display device of embodiment can align number of poles according to being written of frame number and negative pole data are written of frame
Number counts respectively, refreshes less than the timing change of the threshold value predetermined in both equal timings or both differences
Rate.
It addition, the display device of embodiment can calculate positive pole data respectively is written of the time and negative pole data are write
The time entered, change refresh rate in both equal timings or both differences less than the timing of the threshold value predetermined.
No matter which kind of situation, the display unfavorable condition such as the display device of embodiment all ghosts in each pixel is difficult to send out
The refresh rate of raw timing change display floater.
(summary)
As it has been described above, the driving means of a mode of the present invention drives the display floater with multiple pixel, above-mentioned driving
Device is characterised by, possesses refresh rate changing unit, and above-mentioned refresh rate changing unit is at least to above-mentioned display floater
Individual pixel receives when being alternatively written into the source signal of the source signal of positive pole and negative pole in units of 1 frame or multiple frame
In the case of the change instruction of the refresh rate of above-mentioned display floater, at least one pixel above-mentioned, at the source electrode of above-mentioned positive pole
Signal is written of the source signal of time and above-mentioned negative pole and is written of the timing of time balance and changes above-mentioned refresh rate.
In the above-described configuration, so-called " balance " refers to that above-mentioned twice are equal, but is not limited to this, if not becoming
For the degree of the occurrence cause of the display unfavorable condition such as ghost, the most also comprise different situation of above-mentioned twice.Therefore, according to this
Driving means, can be at the refresh rate of the timing change display floater of the display unfavorable conditions such as the ghost being difficult to occur in each pixel.
Additionally, above-mentioned composition relates to " in units of 1 frame or multiple frame, at least one pixel being alternatively written into positive pole
Source signal and the source signal of negative pole " inversion driving mode, this inversion driving mode comprises an inversion driving mode, source
The various inversion driving modes such as umpolung type of drive, frame inversion driving mode.
In above-mentioned driving means, the most above-mentioned refresh rate changing unit at least one pixel above-mentioned, above-mentioned just
The source signal of pole is written of the source signal of time and above-mentioned negative pole and is written of the difference of time than the time predetermined
Above-mentioned refresh rate is changed in short timing.
According to this composition, the source signal being written of time and negative pole by the source signal comparing positive pole is written of
Being simply formed of time, can easily determine whether to change refresh rate.
In the above-described configuration, so-called " time predetermined " expression such as will not become the display unfavorable conditions such as ghost
The degree of occurrence cause, positive pole data are written of the time and negative pole data are written of the allowed band of difference of time.Cause
This, is according to this driving means, can be at the timing change display floater of the display unfavorable conditions such as the ghost being difficult to occur in each pixel
Refresh rate.
In above-mentioned driving means, the most above-mentioned refresh rate changing unit at least one pixel above-mentioned, above-mentioned just
The source signal of pole is written of the source signal of time and above-mentioned negative pole and is written of time equal timing and changes above-mentioned brush
New rate.
According to this composition, can positive pole data be written of the time and negative pole data be written of time equal timing,
The timing change refresh rate of the display unfavorable conditions such as ghost i.e. will not occur.
In above-mentioned driving means, the most above-mentioned refresh rate changing unit be alternatively written in units of 1 frame above-mentioned
In the case of the frame reversion of the source signal of positive pole and the source signal of above-mentioned negative pole receives above-mentioned change instruction when driving,
The source signal of above-mentioned positive pole is written of the source signal of number of times and above-mentioned negative pole and is written of the sum of number of times and becomes even number
Timing change above-mentioned refresh rate.
According to this composition, the calculation process etc. of complexity need not be carried out, simply judge whether above-mentioned sum is even number, just can hold
Easily determine whether to change refresh rate.
It addition, in above-mentioned driving means, the most above-mentioned refresh rate changing unit is in the feelings receiving above-mentioned change instruction
Under condition, the source signal of above-mentioned positive pole be written of the sum of the frame number that the source signal of frame number and this positive pole is kept with on
State the timing that the source signal of negative pole is written of the sum of the frame number that the source signal of frame number and this negative pole is kept equal to become
More above-mentioned refresh rate.
According to this composition, even waiting the situation during the frame of the write not carrying out source signal during comprising termination, also
Suitably judging the source signal of positive pole to be written of the source signal of time and negative pole, to be written of the time the most equal.
It addition, in above-mentioned driving means, the most above-mentioned refresh rate changing unit is being alternatively written in units of 1 frame
When the frame reversion of the source signal of above-mentioned positive pole and the source signal of above-mentioned negative pole receives above-mentioned change instruction when driving, upper
State the source signal of positive pole be written of the source signal of frame number and above-mentioned negative pole be written of frame number unequal in the case of, make
Constant time lag 1 frame of above-mentioned change.
According to this composition, the calculation process etc. of complexity need not be carried out, simply make constant time lag 1 frame of change, just can be easily
Make positive pole data be written of the time and negative pole data are written of time consistency.
It addition, preferred above-mentioned refresh rate changing unit is being alternatively written in units of N number of frame in above-mentioned driving means
When the frame reversion of the source signal of above-mentioned positive pole and the source signal of above-mentioned negative pole receives above-mentioned change instruction when driving, upper
State the source signal of positive pole be written of the source signal of frame number and above-mentioned negative pole be written of frame number unequal in the case of, make
The constant time lag of above-mentioned change is to the frame of the multiple becoming 2N.
According to this composition, the calculation process etc. of complexity need not be carried out, can easily determine the timing of change.
It addition, in above-mentioned driving means, the most above-mentioned refresh rate changing unit is in the change having carried out above-mentioned refresh rate
The next frame of frame receive above-mentioned change instruction in the case of, do not carry out the change of above-mentioned refresh rate based on this change instruction
More.
According to this composition, also can prevent positive pole data be written of time and negative pole data be written of the time time
Between poor.
It addition, in above-mentioned driving means, the most above-mentioned refresh rate changing unit is by arranging the above-mentioned display floater of termination
Driving termination during make above-mentioned refresh rate reduce.
According to this composition, be not provided with stopping during reduce refresh rate compared with can more reduce power consumption.
It addition, the display device of a mode of the present invention is characterised by possessing: have the display floater of multiple pixel；With
And above-mentioned driving means.
According to this display device, it is provided that the display device playing the effect as above-mentioned driving means.
In above-mentioned display device, the semiconductor layer of the most above-mentioned respective TFT of multiple pixels uses oxide semiconductor.
Particularly in above-mentioned display device, the most above-mentioned oxide semiconductor is IGZO.
According to this composition, on state characteristic and the cut-off characteristics of each pixel are the most excellent, and the increase and decrease of refresh rate is easy, the most just
The write time difference of the source signal of pole and the source signal of negative pole easily becomes big, so the necessity eliminating this time difference becomes
High.Therefore, by applying the present invention in such display device, more useful effect can be played.
Industrial utilizability
The display device of one mode of the present invention can be each in liquid crystal indicator, organic EL display and Electronic Paper etc.
Kind of display device utilizes, particularly can be suitably with in the various display devices using active matrix mode.
Description of reference numerals
1 display device
2 display floaters
10 circuit of display driving (driving means)
12 timing controllers
14 scan line drive circuits
16 signal-line driving circuits
18 common electrode drive circuit
20 polarity inversion control portions
22 refresh rate changing units
24 Variation control portions (frame rate switch control unit)
26 enumerators
28 power supply generative circuits
30 system side control portions
Claims (6)
1. a driving means, its driving has the display floater of multiple pixel, and above-mentioned driving means is characterised by,
Possess refresh rate changing unit, above-mentioned refresh rate changing unit at least one pixel of above-mentioned display floater with 1
Frame or multiple frame be unit be alternatively written into the source signal of positive pole and negative pole source signal time receive above-mentioned display surface
In the case of the change instruction of the refresh rate of plate, at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written into
Time and the source signal of above-mentioned negative pole be written of time equal timing and change above-mentioned refresh rate,
Above-mentioned refresh rate changing unit
In at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written of time and the source signal of above-mentioned negative pole
The timing above-mentioned refresh rate of change that the time that is written of is equal,
Above-mentioned refresh rate changing unit
Frame reversion in the source signal of the source signal and above-mentioned negative pole being alternatively written into above-mentioned positive pole in units of N number of frame is driven
When receiving above-mentioned change instruction time dynamic, the source signal at above-mentioned positive pole is written of frame number and the source signal of above-mentioned negative pole
Be written of frame number unequal in the case of, make the constant time lag frame to the multiple becoming 2N of above-mentioned change,
Above-mentioned refresh rate changing unit
In the case of the next frame having carried out the frame of change of above-mentioned refresh rate receives above-mentioned change instruction, do not carry out based on
The change of the above-mentioned refresh rate of this change instruction.
Driving means the most according to claim 1, it is characterised in that
Above-mentioned refresh rate changing unit
Above-mentioned refresh rate is made to reduce by during the termination that arranges the driving stopping above-mentioned display floater.
3. a display device, it is characterised in that
Possess:
There is the display floater of multiple pixel；And
Driving means described in claim 1 or 2.
Display device the most according to claim 3, it is characterised in that the semiconductor layer of the above-mentioned respective TFT of multiple pixels
Use oxide semiconductor.
Display device the most according to claim 4, it is characterised in that above-mentioned oxide semiconductor is IGZO.
6. a driving means, its driving has the display floater of multiple pixel, and above-mentioned driving means is characterised by,
Possess refresh rate changing unit, above-mentioned refresh rate changing unit at least one pixel of above-mentioned display floater with 1
Frame or multiple frame be unit be alternatively written into the source signal of positive pole and negative pole source signal time receive above-mentioned display surface
In the case of the change instruction of the refresh rate of plate, at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written into
Time and the source signal of above-mentioned negative pole be written of time equal timing and change above-mentioned refresh rate,
Above-mentioned refresh rate changing unit
In at least one pixel above-mentioned, the source signal at above-mentioned positive pole is written of time and the source signal of above-mentioned negative pole
The timing above-mentioned refresh rate of change that the time that is written of is equal,
Above-mentioned refresh rate changing unit
In the case of the next frame having carried out the frame of change of above-mentioned refresh rate receives above-mentioned change instruction, do not carry out based on
The change of the above-mentioned refresh rate of this change instruction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012034513 | 2012-02-20 | ||
| JP2012-034513 | 2012-02-20 | ||
| PCT/JP2013/053334 WO2013125406A1 (en) | 2012-02-20 | 2013-02-13 | Drive device and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104115216A CN104115216A (en) | 2014-10-22 |
| CN104115216B true CN104115216B (en) | 2016-12-14 |
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| WO2015087587A1 (en) * | 2013-12-11 | 2015-06-18 | シャープ株式会社 | Liquid crystal display device and drive method therefor |
| KR102102912B1 (en) * | 2013-12-23 | 2020-04-21 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device |
| EP3138092A4 (en) * | 2014-04-17 | 2018-02-14 | Pricer AB | Scanning method for a display device |
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| US10008182B2 (en) * | 2014-09-12 | 2018-06-26 | Samsung Electronics Co., Ltd. | System-on-chip (SoC) devices, display drivers and SoC systems including the same |
| KR102297064B1 (en) * | 2014-09-12 | 2021-09-01 | 삼성전자주식회사 | SoC device, display driver and SoC system comprising the same |
| JP6512789B2 (en) * | 2014-10-17 | 2019-05-15 | シャープ株式会社 | Liquid crystal display device and control method of liquid crystal display device |
| US9830849B2 (en) | 2015-02-09 | 2017-11-28 | Apple Inc. | Entry controlled inversion imbalance compensation |
| KR102325816B1 (en) * | 2015-04-29 | 2021-11-12 | 엘지디스플레이 주식회사 | Display Device Being Capable Of Driving In Low-Speed And Driving Method Of The Same |
| US9922608B2 (en) * | 2015-05-27 | 2018-03-20 | Apple Inc. | Electronic device display with charge accumulation tracker |
| JP6609313B2 (en) * | 2015-06-05 | 2019-11-20 | シャープ株式会社 | Control device, display device, control method, and control program |
| US20170092210A1 (en) * | 2015-09-25 | 2017-03-30 | Apple Inc. | Devices and methods for mitigating variable refresh rate charge imbalance |
| US20190108804A1 (en) * | 2016-03-25 | 2019-04-11 | Sharp Kabushiki Kaisha | Liquid crystal display device and method of controlling the same |
| US10133403B2 (en) | 2016-06-29 | 2018-11-20 | Apple Inc. | System and method for variable frame duration control in an electronic display |
| KR102553184B1 (en) * | 2016-08-30 | 2023-07-06 | 엘지디스플레이 주식회사 | Display device and its driving method |
| CN109716426A (en) * | 2016-09-30 | 2019-05-03 | 株式会社半导体能源研究所 | Display system and electronic equipment |
| WO2018116939A1 (en) * | 2016-12-21 | 2018-06-28 | シャープ株式会社 | Display device |
| KR102402766B1 (en) * | 2017-10-19 | 2022-05-26 | 엘지디스플레이 주식회사 | Displaying image on low refresh rate mode and device implementing thereof |
| KR102559088B1 (en) * | 2018-08-07 | 2023-07-24 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device And Driving Method Thereof |
| CN111128082B (en) * | 2019-12-31 | 2022-03-01 | 惠州视维新技术有限公司 | Backlight adjusting method, display and storage medium |
| CN111883073B (en) * | 2020-07-22 | 2022-02-25 | 上海创功通讯技术有限公司 | Display method of electronic equipment and electronic equipment |
| CN114120933A (en) * | 2021-12-06 | 2022-03-01 | 京东方科技集团股份有限公司 | Display panel driving method and display device |
| CN115116411B (en) * | 2022-05-17 | 2023-08-04 | 广西世纪创新显示电子有限公司 | Method for eliminating terminal screen flicker |
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- 2013-02-13 JP JP2014500668A patent/JP5837177B2/en not_active Expired - Fee Related
- 2013-02-13 WO PCT/JP2013/053334 patent/WO2013125406A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104115216A (en) | 2014-10-22 |
| WO2013125406A1 (en) | 2013-08-29 |
| TW201335925A (en) | 2013-09-01 |
| JP5837177B2 (en) | 2015-12-24 |
| US9564092B2 (en) | 2017-02-07 |
| US20150002381A1 (en) | 2015-01-01 |
| TWI544469B (en) | 2016-08-01 |
| JPWO2013125406A1 (en) | 2015-07-30 |
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